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Derivative Instruments and Hedging Activity - Fair Value (Details) - Interest Rate Swap [Member] - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivatives designated as cash flow hedges    
Interest Rate Cash Flow Hedge Asset at Fair Value $ 334 $ 2,539
Interest Rate Cash Flow Hedge Liability at Fair Value $ 6,931 $ 1,135